We have discovered that if you place the shoes by the side of the wood stove for just a few minutes, the beeswax spreads a lot easier, as it melts into the shoes.
One treatment and they are nice and dry for nearly 2 years. Really.
But if they have a suede knap surface, realize that they will lose their texture as the wax coats it. They are not as pretty, but they will stay dry.
P.S. If you don't have a wood stove, put them in the oven on aluminum foil at 200 degrees for a few minutes (but, be sure your spouse is out of the house when you do that).
Give either method a try. But I think you will find beeswax much better than the silicon aerosol spray they sell you.